%0 Journal Article %T Design And Tolerance Analysis Of Null Lens For Testing Hyperboloid Concave Mirror %A Saxena, K. K. %A Rao, D. V. B. %A Babu, N. J. %A Alex, T. K. %J Proceedings of SPIE %V 8 %P 66-71 %@ 0277-786X %D 1987-09-28 %I SPIE %~ DeepDyve